Electrical device and method of making the same



Jne 23, 1931.. o. s. MARcKwoRTH 1,811,725

ELECTRICAL DEVICE AND METHOD OF MAKING THE SAME Filed sept. 18. 1922 Patented June 23, 1931 l l I UNITED STATES PATENT OFFICE OTTO S. MARCKWORTH, OF COLUMBUS, OHIO ELECTRICAL DEVICE AND METHOD OF MAKING` THE SAME Application led September 18, 1922. Serial No. 588,922.

This invention is an electric device of comprocedure as will Weld said components toposite structure, and method of making the gether or unite them firmly. The edges of same. the completed unit thus provided, which may One of the objects of the invention is to so contain any. number of components or intreat dielectric and conductive components, dividual elements, are then preferably fur- 55 that they are welded and united by a permather sealed with a dielectric substance 13, nent union, and hermetically sealed so as to such as bakelite, varnish, pyroXylin lacquer,

` prevent access of air, moisture or any other or other suitable medium. Of course where substance, to cause its deterioration or to inthe device is to be used for electrical purterfere with its proper function. A further poses, for instance; as a condenser, contact- 60 object is to provide a composite article for ing leads 14 Will havebeen placed in conelectrical purposes, in which the parts are so tact with the respective metallic deposits closely united that penetration of foreign 10, and brought out of the unit in such mansubstances is prevented, thereby avoiding ner that all or any part of the area of the l5 leakageand assuring uniform results. A conductive films may be connected at Will. 65

further, object is to provide a device of the As a specific example, thin sheets of glass character mentioned which Will be compact 11, which have been silvered as indicated at and rugged to stand rough handling'and 10, oneither or both sides by any suitable which will be protected against possible meor preferred process, are separated by thin 2o chanical injury. A further objectis to prosheets or Iilms- 12 of celluloid,the thickness 70 Vide an electric condenser of small volume `depending upon the` requiredv dielectric and maximum capacity. strength. Before placing the sheets 12 in The invention` will be hereinafter fully position they are moistened with a latent set forth and particularly pointed out in the solvent of Celluloid, such as a solution of claims. f camphor in fusel oi1.` When the desired num- 75 In the accompanying drawing, the figure ber of components 10, `11, and interposed is asectional View7 illustrating dia rammati- Y sheets 12 have been assembled, with conductca1ly,adevice constructed in accor ance with ing leads 14 (e. g. of very thin copper or the invention. brass foil), properly placed in contact with To produce a device conforming to the inthe silver and brought out at the side,'or so vention, films of metal 10 are carefullyand through openings otherwise located, the enpermanently deposited upon sheets 11 of ditire mass is placed under compression at electric material, so as to present a continuous such a `temperature that the Celluloid will contacting mediumI on each sheet. These mebecome semi-plastic and adhesive andfirm-l tallic deposits may originally have been in ly Weld the components together. For in- 85 the form ofsheets, powders, solutions or any stance, fifty pounds per square inch presother form recognized in the arts, by which sure at 150 C., will effect the union of the metal may be applied to surfaces. The films individual elements into a single rugged may or may not cover the entire area of the unit of very great strength and high capacdielectric sheet, and may be deposited upon ity. 90

one or both sides as desired. The method by which the celluloid is Any desired number of components each' treated by a retarded solvent and then maconsisting of a dielectric sheet With the film nipulated to produce a laminated article, is or films of metal deposited thereon, may then more fully discussed in my Patent Number be assembled asfshown in the drawing, with 1,421,974, issued July 4, 1922. 95 welding sheets 12 of mica, bakelite, Celluloid, After the dielectric sheets with their atrubber or any other suitable dielectric intertached lms of metal have been permanently posed between them to separate the metallic welded together, the edges of the completed deposits 10. The assembled components and unit are further sealed as before stated, with welding sheets are then subjected to such a dielectric substance.\ 100 One of the advantages of an article constructed as above described, especially when used as an electric condenser, is that close contact between the conductor and dielectric is secured, which Contact is so intimate and permanent that neither air, other gases, moisture or any other substance' can penetrate, even after a long period of exposure' under pressure. A further advantage is that the parts are so closely united that penetration of foreign substances is prevented, and the intimate contact secured necessarily results in an increase of electrical capacity, prevents leakage, and assures uniform results. At the same time th'e metallic films are permanently protected against possible mechanical injury. The units are so compact and rugged in fact, that they will stand practically any amount of abuse. A further decided advantage is that of a greater capacity per unit of area than has eretofore been possible.

Havingl thus explained the nature of the invention and described an operative manner i plurality article comprisin of constructing and using the same, although without attempting to set forth all of the forms in which itmay be made, or all of the forms of its use, what is claimed is l. The method of constructing a composite first producing components for said artic e by applying a permanent conductive surface coating to each one of a of sheets of dielectric material', moistenmg binder sheets with a solvent which ,is normally inca able of attacking the binder sheet, so that t e condition of said binder sheet remains unchanged during the application of the solvent, interposing the moistened binder sheets between and in contact :with the coated surfaces of two or more of said components, and finally causing said solvent to become sufficiently active to soften the moistened portions of said binder sheets so' as tocause the moistened surfaces to unite .with contiguous coated surfaces of other components.

2. The method of constructing a compositeV arlicle comprisin first producing components for said artic e by applying a permanent l.conductive surface coating to each on 'of a plurality of sheets of dielectric ma rial, moistening binder sheets with a solvent which is normally inca able of attacking the binder sheet, so that t e condition of said binder .sheet remains unchanged duringl the application of the solvent, interposing the moistened binder sheets between and in contact with the coated surfaces of two or more of said components, applying pressure to cause Isad solvent to become sufficiently active to soften the moistened portions of the binder sheetand also to cause said moistened surfaces to unite said components, and finally hermetically sealing the edges of the united components and said binder sheets.

3. 'I he method of constructing a composite article comprisin first producing components for said artic e by applying a permanent metallic surface coatin to each one of a plurality of sheets of die ectric material, moistening binder sheets with a solvent which is normally incapable of attacking the binder sheet so that the condition of the binder` sheet remains unchanged during the application of the solvent, placing conductor leads in contact with the metallic coated surfaces of said components, interposing the binder sheets between and in contact with the coated surfaces of two or more components and also in engagement with the inner ends of the respective conductor leads, and finally causing said solvent to become sufficiently active to soften -the moistened portions of said binder sheets -4 side faces thereof, conductor leads contacting with the-respective conducting surfaces, and sheets ofilat dielectric binding 'material interposed between contiguous coated surfaces of adjacent components, said sheets ofbind-l ing material having partially dissolved sur faces which adhere to said coated surfaces so as to permanently unite the components and also anchor said conductor leads.

5. An electric device of the character de: scribed comprising a plurality of components. each consisting of a fiat dielectrlc body provided with a permanent coating of conductive material coextensive with the areas of the side faces thereof, and sheets of at celluloid interposed between contiguous coated surfaces of adjacent components, said sheets of celluloid having partially dissolved surfaces which adhere to said coated surfaces,

so as to permanently unite said components. In testimony whereof I have hereunto set 

